feat: 预测性成本智能模块上线(IMA 2026.7前沿) — 接线+重建页面

- CostIntelligence.vue 重建(被清理的未提交文件): 模型选择(线性/移动平均)+预测期数+统计卡+KPI表格+趋势图
- 路由: /cost-intelligence(挂财务维度D执行与控制), 修正 predict/cost-intelligence 路径不匹配
- 菜单: 预测性成本智能(ceo/finance/it)
- 后端API已存在: /predict/kpi-forecast/finance (kpi_forecast_engine)
- 验证: Chrome实测 5 KPI预测(厂补率/营收/净利/费用率/毛利), 趋势图渲染, pytest不影响
- 注: 置信度诚实标注(全部low=历史数据波动大, MVP原则)

frontend/src/router/index.ts

@@ -28,7 +28,7 @@ const routes = [
       { path: 'cost', name: 'CostDashboard', component: () => import('@/views/CostDashboard.vue'), meta: { title: '成本分析', roles: ['ceo', 'finance', 'it'] } },
       { path: 'predict', name: 'PredictDashboard', component: () => import('@/views/PredictDashboard.vue'), meta: { title: '预测模拟', roles: ['ceo', 'finance', 'it'] } },
       { path: 'predict/accuracy', name: 'PredictAccuracy', component: () => import('@/views/PredictAccuracy.vue'), meta: { title: '预测准确率', roles: ['ceo', 'finance', 'it'] } },
-      { path: 'predict/cost-intelligence', name: 'CostIntelligence', component: () => import('@/views/CostIntelligence.vue'), meta: { title: '预测性成本智能', roles: ['ceo', 'finance', 'it'] } },
+      { path: 'cost-intelligence', name: 'CostIntelligence', component: () => import('@/views/CostIntelligence.vue'), meta: { title: '预测性成本智能', roles: ['ceo', 'finance', 'it'] } },
       { path: 'real-options', name: 'RealOptions', component: () => import('@/views/RealOptions.vue'), meta: { title: '实物期权计算器', roles: ['ceo', 'finance'] } },
       { path: 'action-plans', name: 'ActionPlans', component: () => import('@/views/ActionPlanLibrary.vue'), meta: { title: '改善行动', roles: ['ceo', 'finance', 'business', 'it'], editable: true } },
       { path: 'reports', name: 'ReportCenter', component: () => import('@/views/ReportCenter.vue'), meta: { title: '管理报表', roles: ['ceo', 'finance', 'business'] } },